Excessive micro-segments causing jerky motion on older CNC (NUM controller)

Дата публикации: 23-06-2026 10:16:32

Hi all,I'm using Fusion 360 CAM with a custom postprocessor (ccsoftcz.com, SCM/Xilog format) to generate programs for an SCM Record 220 with NUM controller.The problem: Curves and contours are output as hundreds of tiny G1 segments (some as small as 0.07mm apart). My older NUM controller has limited look-ahead, so it decelerates at every segment -- causing severe jerking, extremely slow actual feed rates, and we've had 2 fire incidents from the tool dwelling in the material.What I've tried:Tolerance set to 0.1mm -- no improvementSwitched from 2D Contour to 3D Contour -- improves large curves but makes small curves worseExample from G-code output:G1 X=514.085 Y=1201.328
G1 X=514.016 Y=1201.334 ← 0.07mm differenceThe postprocessor does output G2/G3 for some arcs, but most curves are still linearized.My question: What Fusion 360 CAM settings can I adjust to reduce the number of micro-segments? Specifically for older controllers that can't handle high-density point data. I'm looking for settings like smoothing, minimum segment length, arc fitting, or alternative toolpath strategies.I can share the Fusion file and postprocessor (.cps) if that helps.Setup:Fusion 360 (latest)SCM Record 220 / NUM controller (year 2000)Material: solid hardwood (oak, douglas, larch)Postprocessor: ccsoftcz.com (SCM/Xilog format)

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